import tkinter  # 导入tkinter模块

root = tkinter.Tk()
root.minsize(280, 500)
root.title('菜鸟计算器')

# 1.界面布局
# 显示面板
result = tkinter.StringVar()
result.set('0')  # 初始值，显示面板显示结果1，用于显示默认数字0
result2 = tkinter.StringVar()  # 显示面板显示结果2，用于显示计算过程
result2.set('初始过程')
# 显示版  font 字体，字体大小；bg背景颜色；fg字体颜色   anchor:组件对齐方式；
label = tkinter.Label(root, font=('微软雅黑', 20), bg='#EE9572', bd='9', fg='#32CD32', anchor='se', textvariable=result2)
# 组件的放置和排版（pack,grid,place)
label.place(width=280, height=170)
label2 = tkinter.Label(root, font=('微软雅黑', 30), bg='#EEE9E9', bd='9', fg='black', anchor='se', textvariable=result)
label2.place(y=170, width=280, height=60)

# 数字键按钮

btn7 = tkinter.Button(root, text='7', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressNum('7'))
btn7.place(x=0, y=285, width=70, height=55)
btn8 = tkinter.Button(root, text='8', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressNum('8'))
btn8.place(x=70, y=285, width=70, height=55)
btn9 = tkinter.Button(root, text='9', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressNum('9'))
btn9.place(x=140, y=285, width=70, height=55)

btn4 = tkinter.Button(root, text='4', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressNum('4'))
btn4.place(x=0, y=340, width=70, height=55)
btn5 = tkinter.Button(root, text='5', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressNum('5'))
btn5.place(x=70, y=340, width=70, height=55)
btn6 = tkinter.Button(root, text='6', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressNum('6'))
btn6.place(x=140, y=340, width=70, height=55)

btn1 = tkinter.Button(root, text='1', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressNum('1'))
btn1.place(x=0, y=395, width=70, height=55)
btn2 = tkinter.Button(root, text='2', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressNum('2'))
btn2.place(x=70, y=395, width=70, height=55)
btn3 = tkinter.Button(root, text='3', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressNum('3'))
btn3.place(x=140, y=395, width=70, height=55)
btn0 = tkinter.Button(root, text='0', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressNum('0'))
btn0.place(x=70, y=450, width=70, height=55)

# 运算符号按钮
btnac = tkinter.Button(root, text='AC', bd=0.5, font=('黑体', 20), fg='orange', command=lambda: pressCompute('AC'))
btnac.place(x=0, y=230, width=70, height=55)
btnback = tkinter.Button(root, text='←', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressCompute('b'))
btnback.place(x=70, y=230, width=70, height=55)
btndivi = tkinter.Button(root, text='÷', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressCompute('/'))
btndivi.place(x=140, y=230, width=70, height=55)
btnmul = tkinter.Button(root, text='×', font=('微软雅黑', 20), fg="#4F4F4F", bd=0.5, command=lambda: pressCompute('*'))
btnmul.place(x=210, y=230, width=70, height=55)
btnsub = tkinter.Button(root, text='-', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressCompute('-'))
btnsub.place(x=210, y=285, width=70, height=55)
btnadd = tkinter.Button(root, text='+', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressCompute('+'))
btnadd.place(x=210, y=340, width=70, height=55)
btnequ = tkinter.Button(root, text='=', bg='orange', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5,
                        command=lambda: pressEqual())
btnequ.place(x=210, y=395, width=70, height=110)
btnper = tkinter.Button(root, text='%', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressCompute('%'))
btnper.place(x=0, y=450, width=70, height=55)
btnpoint = tkinter.Button(root, text='.', font=('微软雅黑', 20), fg='#4F4F4F', bd=0.5, command=lambda: pressCompute('.'))
btnpoint.place(x=140, y=450, width=70, height=55)

# 操作函数
lists = []  # 设置一个变量 保存运算数字和符号的列表
isPressSign = False  # 添加一个判断是否按下运算符号的标志,假设默认没有按下按钮
isPressNum = False


# 数字函数
def pressNum(num):  # 设置一个数字函数 判断是否按下数字 并获取数字将数字写在显示版上
    global lists  # 全局化lists和按钮状态isPressSign
    global isPressSign
    if not isPressSign:
        pass
    else:  # 重新将运算符号状态设置为否
        result.set(0)
        isPressSign = False

    # 判断界面的数字是否为0
    oldnum = result.get()  # 第一步
    if oldnum == '0':  # 如过界面上数字为0 则获取按下的数字
        result.set(num)
    else:  # 如果界面上的而数字不是0  则链接上新按下的数字
        newnum = oldnum + num
        result.set(newnum)  # 将按下的数字写到面板中


# 运算函数
def pressCompute(sign):
    global lists
    global isPressSign
    num = result.get()  # 获取界面数字
    lists.append(num)  # 保存界面获取的数字到列表中

    lists.append(sign)  # 讲按下的运算符号保存到列表中
    isPressSign = True

    if sign == 'AC':  # 如果按下的是'AC'按键，则清空列表内容，讲屏幕上的数字键设置为默认数字0
        lists.clear()
        result.set(0)
    if sign == 'b':  # 如果按下的是退格‘’，则选取当前数字第一位到倒数第二位
        a = num[0:-1]
        lists.clear()
        result.set(a)


# 获取运算结果函数
def pressEqual():
    global lists
    global isPressSign

    curnum = result.get()  # 设置当前数字变量，并获取添加到列表
    lists.append(curnum)

    computrStr = ''.join(lists)  # 讲列表内容用join命令将字符串链接起来
    endNum = eval(computrStr)  # 用eval命令运算字符串中的内容
    #    a = str(endNum)
    #   b = '='+a                       #给运算结果前添加一个 ‘=’ 显示   不过这样写会有BUG 不能连续运算，这里注释，不要 =
    #   c = b[0:10]                     #所有的运算结果取9位数
    result.set(endNum)  # 讲运算结果显示到屏幕1
    result2.set(computrStr)  # 将运算过程显示到屏幕2
    lists.clear()  # 清空列表内容


root.mainloop()
